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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/consts/miri_unleashed/mutable_references_err.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/test/ui/consts/miri_unleashed/mutable_references_err.rs | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/test/ui/consts/miri_unleashed/mutable_references_err.rs b/src/test/ui/consts/miri_unleashed/mutable_references_err.rs new file mode 100644 index 000000000..722b9cf94 --- /dev/null +++ b/src/test/ui/consts/miri_unleashed/mutable_references_err.rs @@ -0,0 +1,38 @@ +// stderr-per-bitwidth +// compile-flags: -Zunleash-the-miri-inside-of-you + +#![allow(const_err)] + +use std::cell::UnsafeCell; + +// this test ensures that our mutability story is sound + +struct Meh { + x: &'static UnsafeCell<i32>, +} +unsafe impl Sync for Meh {} + +// the following will never be ok! no interior mut behind consts, because +// all allocs interned here will be marked immutable. +const MUH: Meh = Meh { //~ ERROR: it is undefined behavior to use this value + x: &UnsafeCell::new(42), +}; + +struct Synced { + x: UnsafeCell<i32>, +} +unsafe impl Sync for Synced {} + +// Make sure we also catch this behind a type-erased `dyn Trait` reference. +const SNEAKY: &dyn Sync = &Synced { x: UnsafeCell::new(42) }; +//~^ ERROR: it is undefined behavior to use this value + +// Make sure we also catch mutable references. +const BLUNT: &mut i32 = &mut 42; +//~^ ERROR: it is undefined behavior to use this value + +fn main() { + unsafe { + *MUH.x.get() = 99; + } +} |